Dry Room Multi-Zone Exhaust Control for Rapid Dew Point Normalization
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Solution Overview
Problem
In dry rooms used for secondary battery production, maintaining low humidity is challenging due to temporary increases caused by human entry and exit, moisture emission, and other factors, which require efficient and quick humidity adjustment.
Innovation Solution
The implementation of a dry room system with multiple exhaust units in different regions, each individually adjusting air exhaust amounts based on detected changes in dew point temperature, utilizing detection units to preempt and manage humidity rises, ensuring precise control of dew point temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple exhaust units are disposed in different regions to individually adjust exhaust amounts, then the dew point temperature control precision is improved, but the device complexity increases
Solution Approach 1:
The exhaust system is segmented into multiple independent exhaust units (first exhaust unit, second exhaust unit, etc.) disposed in different regions of the cleanroom. Each exhaust unit can independently adjust its exhaust amount based on local dew point temperature conditions, enabling region-specific humidity control without requiring a complete system redesign
Solution Approach 2:
Different regions of the cleanroom are assigned different exhaust characteristics through the individual exhaust units. Each exhaust unit operates independently to address local humidity variations caused by human activity or moisture sources in specific areas, rather than applying uniform exhaust control throughout the entire space
2Speed
If exhaust amounts are individually adjusted in different regions, then the response speed to dew point temperature changes is improved, but the control system complexity increases
Solution Approach 1:
The exhaust units are configured to preemptively respond to dew point temperature changes by continuously monitoring and adjusting exhaust amounts before humidity levels become problematic. This allows the system to normalize dew point temperature quickly after human entry or moisture emission events without requiring complex predictive algorithms
Solution Approach 2:
The control system employs feedback mechanisms where dew point temperature sensors continuously monitor each region and automatically adjust the exhaust amounts of corresponding exhaust units. This closed-loop control enables rapid response to humidity changes while keeping the control logic relatively simple through direct sensor-actuator coupling
3Productivity
If air is preferentially exhausted from regions with risen dew point temperature, then the humidity normalization speed is improved, but the energy consumption increases
Solution Approach 1:
The system applies partial exhaust action by selectively increasing exhaust amounts only in regions where dew point temperature has risen, rather than uniformly increasing exhaust throughout the entire cleanroom. This targeted approach achieves rapid humidity normalization in affected areas while minimizing unnecessary energy consumption in regions that maintain acceptable humidity levels
Data Source
AI summary
A dry room that controls a dew point temperature in a space to be managed, the room includes a plurality of exhaust units that exhaust air in the space to be managed, in which the plurality of exhaust units are disposed in different regions in the space to be managed, and individually adjust an exhaust amount of the air to be exhausted from each of the regions.